Where Sound Comes From

NCERT anchor: NCERT Looking Around Class 1 — Theme: Sound (sources of sound)

• Every sound has a source — something that makes it.
• Simple idea: things vibrate (shake fast) to make sound — tabla skin, vocal cords.
• Trace a sound back to what produced it.

1. Sound has a source

Level 1 (Verbal): Bell rings → bell is the source. Dog barks → dog is the source.

Level 2 (Symbolic): No source → no sound (in simple terms).

Visual: Arrow from tabla to ear labelled 'sound travels'.

2. Vibration (simple)

Verbal: Pluck rubber band — it shakes → you hear sound. Shake stops → sound stops.

Visual: Touch ringing bell gently — feel vibration (with teacher help).

3. Ears hear

Sound travels to ears — protect ears from very loud sources.

Finding the source of the school bell

Step 1 — Hear bell → ask: what is ringing?
Step 2 — Source = metal bell in corridor, struck by hammer/electric ringer.
Step 3 — Bell vibrates → sound reaches classroom.
Step 4 — Cover ears if too loud; still identify source.
Answer: the bell (and what hits it) is the source.

• What is the source of a dog's bark?
• Pluck a rubber band — what do you see before you hear?
• Where does song from radio come from?
• Stretch: If a tabla stops vibrating, what happens to the sound?

Revision tip: Play 'Find the source' — hear a sound, point to what made it.

Open the Practice tab for graded questions on Where Sound Comes From.